import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class E06_ReplaceRepeatingChars {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char[] ch = scanner.nextLine().toCharArray();
        List<Character> characterList = new ArrayList<>();
        for (int i = 0; i < ch.length; i++) {
            characterList.add(ch[i]);
        }

        for (int i = 0; i < characterList.size(); i++) {
            if (i == characterList.size() - 1){
                break;
            }
            char first = characterList.get(i);
            char second = characterList.get(i + 1);


            if (first == second){
                characterList.remove(characterList.get(i));
                i--;
            }
        }
        for (Character character : characterList) {
            System.out.print(character);
        }
    }
}